JP2005221905A - Structure of image forming apparatus and image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To keep the rigidity balance of a base part in the structure of an image forming apparatus uniform, and to hereby prevent the distortion of an entire image forming apparatus. <P>SOLUTION: The structure of the image forming apparatus includes an upper skeleton body in which an original reading unit and an image forming unit are at least housed and held; a lower skeleton body in which a paper supply unit is at least housed and held; and the base part which supports the lower skeleton body, and the base part is constituted by including a base main body and a base reinforcing body. The base main body includes a base plate; a flange part formed on the outer circumference of the base plate by providing a recessed part at the inner part of the base plate; a side plate erected along the outer circumference of the flange part; and mount parts which are disposed around the four corners of the base plate and on which the member of the lower skeleton body for installing the apparatus main body is mounted. The base reinforcing body includes intermediate members disposed at disposed positions between the respective mount parts and the longitudinal-direction flange part; a connecting part for connecting the intermediate members with the longitudinal-direction flange part; and a joining part disposed at a disposed position opposed to a diagonal through the connecting part and joining all the intermediate members. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a structure of an image forming apparatus and an image forming apparatus, and more particularly to a structure of a base portion in the structure of the image forming apparatus.

  In general, a general console type image forming apparatus is configured so that each unit can be pulled out to the front side so that maintenance and inspection work such as paper replenishment, parts replacement, and cleaning can be easily performed. In order to be able to pull out the unit in this way, a front / rear side plate comprising a large opening or notch is formed in the front side plate constituting the structure, and this interferes with the front side plate when the unit is pulled out. Need to prevent. Further, if a large inlet / outlet as described above is formed on a side plate made of a plate material such as a sheet metal, its rigidity is lowered, and sufficient strength cannot be obtained, and there is a risk of breakage. In particular, as the number of units increases, as in the case of an image forming apparatus in which a plurality of developing units are provided around the photosensitive member and supported so that they can be pulled out, a larger inlet / outlet is formed in the front side plate. There was a problem that the reduction of the rigidity becomes remarkable. Therefore, conventionally, the rigidity of the structure has been reduced by increasing the thickness of the side plate constituting the structure or by reinforcing the side plate by adding a number of reinforcing members. However, according to this method, the rigidity of the left and right sides of the apparatus is lower than the rigidity of the structure before and after the apparatus, and the rigidity balance between the front and rear and left and right of the entire apparatus becomes non-uniform and the weight of the entire apparatus also increases.

  On the other hand, since the image forming apparatus has different lengths on the front and rear sides and on the left and right sides, the rigidity balance between the front and rear directions and the left and right directions is not uniform. Further, the image forming apparatus has four or more on-floor support portions such as casters and rubber feet. The image forming apparatus having four on-floor support portions is stabilized by forming a plane at three points on the on-floor support portion at the place of transportation, movement or installation. As a result, the remaining on-floor support is unsupported, that is, floats with respect to the floor. For this reason, if the rigidity of the structure of the image forming apparatus is insufficient, the unsupported portion sinks downward while tilting. If the difference in rigidity balance between the longitudinal direction and the lateral direction of this device is large, the tendency to tilt (twist) becomes stronger. As a result, accuracy such as flatness in the structure of the apparatus cannot be maintained, and quality defects such as right angle of the image are caused.

  Therefore, in recent years, with the improvement in image quality, the structure of the base portion of the structure is not composed of a single sheet metal, but is composed of a combination of two or more sheet metals, or a square pipe is formed in a quadrilateral shape. Several techniques for improving the rigidity of the base portion have been proposed.

  As one of them, Patent Document 1 discloses that the structure of the base part of the structure on which the frame pillar of the apparatus main body is erected is configured by forming a wide square pipe into a quadrilateral shape and reducing the thickness to reduce the height of the apparatus main body. It is configured to suppress and secure rigidity. Therefore, without using a new fixing member, etc., while maintaining or improving the required rigidity and accuracy, the caster mounting position is moved to the center of the device. On the other hand, by lowering the height of the bottom support base, an image forming apparatus having a large paper capacity and hardly falling down has been proposed. Further, in Patent Document 2, two upright side plates provided opposite to each other are integrated with a base portion and a stay attached with a space from the base portion, and a structure of the base portion and at least one stay is provided. There has been proposed an image forming apparatus that is configured in a hollow box shape, thus increasing the rigidity of the apparatus housing (skeleton), maintaining high-precision image quality, and reducing the height of the apparatus main body.

Furthermore, Patent Document 3 discloses that the entire surface of the bottom plate of the structure is uniform and randomly formed with protrusions so that the rigidity of the structure can be maintained in any direction without directionality. Image formation that maintains uniform rigidity in any direction on the bottom plate of the body, maintains the flatness of the bottom plate to prevent distortion of the structure, prevents degradation of image quality, and eliminates noise generation A device and its structure have been proposed. Patent Document 4 discloses a toner image forming apparatus supporting frame that supports a toner image forming apparatus of an image forming apparatus and that is provided with supported portions at three locations, and is arranged below the frame, and the frame. The lower frame for supporting the three supported parts and the three supported parts including the toner image forming apparatus supporting frame and the members supported by the frame when viewed from above and below. And a toner image forming apparatus support frame disposed at the apex of a triangle including the center of gravity of the toner image forming apparatus, and thus a toner image forming apparatus support frame for supporting a toner image forming apparatus such as an image carrier or ROS apparatus. An image forming apparatus that prevents twisting has been proposed.
JP-A-10-232525 JP 2002-217560 A JP 2002-23442 A JP 2000-330351 A

  However, in the method using a square pipe having the same cross-sectional shape as in Patent Document 1, the rigidity balance in the front-rear direction and the left-right direction is the same as long as the lengths of the front and rear and the left and right of the image forming apparatus are different. There was a problem that it could not be made uniform. For this reason, it is possible to consider a method in which the thickness, height, and width of the square pipe along the front-rear direction and the left-right direction are different, and the rigidity balance between the front-rear direction and the left-right direction is made uniform. The problem of increasing will also arise. Further, in Patent Document 2, even if the base portion of the structure has a high rigidity, the rigidity balance in the front-rear direction and the left-right direction cannot be made uniform as long as the front-rear and left-right lengths of the image forming apparatus are different. There was a problem. Further, since the side plate holding the image forming apparatus and the base portion of the structure are directly connected, there is a problem that distortion of the base portion of the structure directly acts on the side wall. Also in Patent Document 3, even if a convex portion is formed on the bottom plate of the base portion of the structure to provide higher rigidity, as long as the lengths of the front and rear and the left and right of the image forming apparatus are different, the rigidity balance in the front and rear direction and the left and right direction There was a problem that it could not be made uniform. Further, as in Patent Document 4, it is only necessary to arrange three supported parts at the apex of a triangle including the entire center of gravity including the toner image forming apparatus supporting frame and the members supported by the frame. There is a problem that the balance of rigidity in the front-rear direction and the left-right direction cannot be made uniform. Further, since the toner image forming apparatus support frame is supported at three positions with respect to the lower frame, the toner image forming apparatus support frame needs to have higher rigidity than the case where the toner image forming apparatus support frame is supported at four positions. There is also a problem that the weight of the image forming apparatus support frame increases. Furthermore, when an elastic position adjusting mechanism is provided on the lower surface of the lower frame, there is a problem that the portability of the image forming apparatus is deteriorated.

  As described above, in order to eliminate the image quality defect caused by the deformation of the image forming apparatus structure, the base portion (support structure) of the image forming apparatus structure on the floor on which the image forming apparatus structure is placed. Thus, it is necessary to reduce the amount of deformation such as the amount of bending or twisting of the image forming apparatus structure due to the base structure.

  The present invention is intended to solve these problems, and maintains the rigidity balance of the base portion in the structure of the image forming apparatus uniformly and prevents distortion of the entire image forming apparatus. An object is to provide an image forming apparatus.

  In order to solve the above-described problems, the structure of the image forming apparatus according to the present invention includes an upper skeleton that stores and holds at least a document reading unit and an image forming unit, and a lower skeleton that stores and holds at least a paper feeding unit. And a base portion that supports the lower skeleton body. And the base part in the structure of the image forming apparatus of this invention is comprised including the base main body and the base reinforcement body. The base body is disposed around the four corners of the bottom plate, a flange portion formed on the outer periphery of the bottom plate by providing a recess inside the bottom plate, a side plate erected along the outer periphery of the flange portion, and the bottom plate. And an attachment portion for attaching a member of the lower skeleton body on which the apparatus main body is installed. In addition, the base reinforcing body is opposed to the diagonal line, an intermediate member disposed at a position between each mounting portion and the longitudinal flange portion, a connecting portion connecting the intermediate member and the longitudinal flange portion, and a diagonal line. And a joining portion that joins all the intermediate members disposed at the disposition position via the connecting portion. Therefore, the rigidity balance of the base portion can be kept uniform and distortion of the entire image forming apparatus can be prevented.

  Further, the base body of the base portion in the structure of the image forming apparatus of the present invention includes a bottom plate, a side plate disposed on the outer peripheral edge of the bottom plate, a frame member disposed along the side plate, and around the four corners of the bottom plate. And an attachment portion for attaching a member of the lower skeleton body on which the apparatus main body disposed in the apparatus is installed. In addition, the base reinforcing body is opposed to the diagonal line, the intermediate member disposed at the position between each attachment portion and the longitudinal frame member, the connecting portion connecting the intermediate member and the longitudinal frame member, and the diagonal line. And a joining portion that joins all the intermediate members disposed at the disposition position via the connecting portion. Therefore, the rigidity balance of the base portion can be kept uniform and distortion of the entire image forming apparatus can be prevented.

  Furthermore, according to the structure of the image forming apparatus of the present invention, the planar shape formed by each connecting portion disposed at the disposed position is a square, and the center of the square and the center of the planar shape of the base body are defined. By matching and arranging the connecting portion at the arrangement position, the rigidity balance of the base portion can be kept uniform.

  According to the structure of the image forming apparatus of the present invention, the length between the disposition position where the connecting portion is disposed and the attachment portion on the opposite side in the longitudinal direction of the base body at the disposition position By arranging the connecting part at the installation position so as to match the length between the mounting parts in the short direction of the base body, no matter which four corners of the base part are unsupported on the floor The base reinforcing body can prevent torsion due to unbalanced rigidity of the base portion.

  Further, the mounting portion, the connecting portion, the flange portion or the frame member are formed by using a side plate formed so as to face the mounting portion and the side plate of the connecting portion at the notch portion connecting the mounting portion and the connecting portion to the flange portion or the frame member. By connecting the two, the rigidity of the entire base portion can be easily increased, and the downward deformation of the base portion can be suppressed.

  Moreover, by forming the concave groove along the longitudinal direction of the flange portion or the frame member, the rigidity of the flange portion or the frame member can be increased, and the downward deformation of the base portion can be suppressed.

  Furthermore, the rigidity of a frame member can be improved by forming a frame member with a square pipe. Further, by making all the cross-sectional shape dimensions of the frame members of the square pipes the same, the cross-sectional secondary moment can be increased, the weight of the base portion can be reduced, and the cost can be reduced.

  Further, by integrally forming the attachment portion and the connecting portion adjacent to the attachment portion with the back plate and the side plate erected along the outer peripheral edge of the back plate, the effect as a fulcrum of deformation of the base portion can be obtained. It can be further demonstrated, and when increasing the rigidity of the base part, it is possible to easily increase the rigidity of the entire base part by simply increasing the thickness of the integrally formed plate without increasing the thickness of the entire bottom plate of the base part. The downward deformation of the base portion can be suppressed.

  Furthermore, the portability of the entire apparatus is improved by attaching the caster to the lower surface of the back plate of the attachment portion. In addition, by attaching a convex installation leg to the lower surface of the back plate of the mounting portion, it is suitable for a stationary type image forming apparatus.

  Further, the intermediate member is formed by a back plate, a side plate erected along the outer peripheral edge of the back plate, and a flange disposed on a longitudinal edge of the side plate, and the flange and the base plate of the base body are connected. Since the intermediate member has a square pipe structure, the rigidity of the intermediate member can be increased, and the action as a fulcrum of deformation of the base portion can be further exhibited.

  Further, the intermediate member is formed of a square pipe, and is formed between an opening on the upper surface of a part of the square pipe and a notch provided on a side surface of the square pipe along an end of the opening. A notch protrusion and a slit portion disposed along the width direction on the lower surface of the square pipe, the openings in the two intermediate members of the square pipe are opposed to each other, and the notch protrusion is the other intermediate member. The two intermediate members are connected by being inserted into the slit portion. Therefore, the square pipes do not interfere with each other, the continuity of the cross-sectional shape is maintained, the rigidity of the intermediate member itself can be maintained, and the action as a fulcrum for the deformation of the base portion can be further exhibited.

  Further, the joint portion is formed by a back plate and a side plate erected along the outer peripheral edge of the back plate, and the end portions of the intermediate members are respectively connected to the side plates of the joint portion, and further, the joint portions are adjacent to each other. By providing the notch portion between the side plates, the intermediate members do not interfere with each other, and the rigidity of the intermediate member can be maintained, so that the connecting portion supported by the intermediate member is more effective as a fulcrum of deformation of the base portion. It can be further demonstrated.

  Further, an image forming apparatus as another invention is characterized in that at least a document reading unit, an image forming unit, and a paper feeding unit are mounted on the structure of the image forming apparatus. Therefore, it is possible to provide a high-rigidity image forming apparatus that can maintain a uniform rigidity balance of the entire apparatus, suppress bending and twisting of the entire image forming apparatus, and prevent distortion of the entire apparatus.

  According to the structure of the image forming apparatus of the present invention, the base reinforcing body improves the rigidity imbalance of the base body, prevents the erected frame member from being largely twisted forward, and increases the rigidity of the base body. Thus, the downward deflection of the erected frame member can be suppressed. According to the present invention, the rigidity balance of the entire apparatus can be kept uniform, and distortion of the entire apparatus can be prevented.

  FIG. 1 is a cross-sectional view schematically showing an electronic copying machine as an example of an image forming apparatus of the present invention. The electronic copying machine shown in the figure is generally called a console type copying machine. The height of the electronic copying machine is set high so that it can be placed on the floor and used. An upper part 1 and a lower part 2 are included. In such a type, the width of the left and right sides of the device is wider than the depth before and after the device. The upper part 1 has an optical unit containing an optical element in a housing, and each unit of an image forming system arranged below the optical unit, and the lower part 2 has a plurality of paper feeding devices. Yes. Also, in such an electronic copying machine, an automatic document feeder 3 is mounted above the upper portion 1.

  Next, a series of image forming processes in the electronic copying machine of FIG. 1 will be described. First, a document (not shown) placed on the document table of the automatic document feeder 3 is supported by the casing of the optical unit. It is automatically fed onto the contact glass and stops. Next, the light source 11 and the sub-scanning optical system 12 of the optical unit are moved to the right from the position shown in FIG. 1. At this time, the original surface is illuminated by the light source 11, and the original image is imaged by the imaging optical system 13. 14 is imaged. Then, the photosensitive member 14 rotates clockwise in FIG. 1, and at this time, the surface is uniformly charged by the charging charger 15, and the original image is formed on the charging surface as described above. As a result, an electrostatic latent image is formed on the photoconductor 14, and this latent image is visualized as a toner image by the developing unit 16. On the other hand, the transfer paper is fed from one of the paper feeders 21 arranged in the lower part 2 toward the photoconductor 14, and the toner image on the photoconductor 14 is transferred to the transfer paper by the transfer charger 17. This transfer paper passes through the fixing unit 18, and the toner image transferred at this time is fixed on the transfer paper, and then the transfer paper is discharged out of the apparatus as copy paper. The electronic copying machine shown in FIG. 1 is configured to perform double-sided copying, but the description thereof is omitted here. The toner remaining on the photoconductor after the toner image is transferred is removed by the cleaning unit 19. As described above, the electronic copying machine shown in FIG. 1 has various parts and units, which are supported by the structure according to the present invention.

  FIG. 2 is a perspective view showing an example of a structure of the image forming apparatus according to the embodiment of the present invention. The structure shown in the figure includes an upper skeleton body 100, a lower skeleton body 200, and a base portion 300. The upper skeleton 100 is a structure of the upper part 1 in FIG. 1 and supports each unit such as the photosensitive member 14, the developing unit 16, the fixing unit 18, and the cleaning unit 19 described above. Further, the lower skeleton 200 is a structure of the lower part 2 in FIG. 1 and supports the sheet feeding device 21 and the like, and includes a plurality of channel-shaped frame members. Furthermore, as can be seen from FIG. 3 which is a perspective view showing the configuration of the base portion, the base portion 300 is configured to include a base body 310 and a base reinforcing body 320, and is longer in the left-right direction than in the front-rear direction. Is formed long. As shown in FIG. 3C, the base body 310 includes a bottom plate 311, a flange portion 312 formed on the outer peripheral edge of the bottom plate 311 by providing a recess inside the bottom plate 311, and four corners around the bottom plate 311. And an attachment portion 313 for attaching a member for installing the apparatus main body disposed in the apparatus. When the right front mounting portion 313 is unsupported with respect to the floor, a modification in which one of the right front portions of the mounting portion 313 of the base body 310 is a power point and the other three mounting portions 313 are fulcrums. It becomes. In particular, the left front and right rear mounting portions 313 serve as starting points of deformation, and the right front mounting portion 313 is deformed downward. In such a deformation mode, the left front and right rear mounting portions 313 are the starting points of deformation, so that the rigidity in the right rear direction from the right front side is the highest, and the imbalance between the right front side and the left front rigidity occurs. The erected frame member is not simply deformed downward, and is largely inclined to the front side, but the base reinforcing body 320 is prevented from being greatly inclined to the front side. Note that a side plate of the apparatus housing (not shown) is erected along the outer peripheral edge of the flange portion 312. Further, the base reinforcing member 320 includes an intermediate member 321 disposed between each mounting portion 313 and the flange portion 312 in the longitudinal direction of the base body 310, and a flange in the longitudinal direction of the intermediate member 321 and the base body 310. The connecting part 322 that connects the part 312 and the joining part 323 that joins the intermediate members 321 to each other are included. And as shown to (a) of FIG. 3, the base part 300 is assembled | attached to the base main body 310 and the base reinforcement body 320, and is comprised. Then, two connecting portions 322 are provided between the left front and right front attaching portions 313 of the base body 310, and two connecting portions 322 are provided between the left rear and right rear attaching portions 313 of the base main body 310. Connecting portions 322 are provided at four locations. Further, these connecting portions 322 are provided at intervals so as to form a substantially square shape when viewed in the vertical direction. For this reason, the length of one side of the square or the interval between the connecting portions 322 substantially coincides with the length in the front-rear direction in the structure of the image forming apparatus. An intermediate member 321 is provided on a square diagonal formed by these four connecting portions 322, and a joint portion 323 of the intermediate member 321 is provided at the center of the square to constitute a base reinforcing body 320. When viewed in the vertical direction, the center of the base reinforcing member 320 substantially coincides with the center of the square formed by the four connecting portions 322. When viewed from the vertical direction, the center of the base reinforcing body 320 and the center of the base main body 310 are substantially aligned, and the base reinforcing body 320 is connected to the base main body 310 to constitute the base portion 300. Further, the intermediate member 321 of the base reinforcing body 320 is connected to the flange portion 312 and the attachment portion 313 of the bottom plate 311 of the base body 310 in addition to the connecting portion 322. Further, the lower skeleton body 200 and the base portion 300 are assembled by a plurality of frame members formed in a channel shape, and these are fixed together by welding, rivets, screws, adhesives, or a combination thereof. The

  As described above, according to the present embodiment, the base portion 300 in the structure of the image forming apparatus includes the base body 310 and the base reinforcing body 320, and is longer in the left-right direction than in the front-rear direction. The length is longer. The base reinforcing body 320 improves the rigidity unbalance of the base body 310, prevents the erected frame member from being greatly inclined to the front side, that is, twisted, and simply deforms or deflects only in the downward direction. Have If the base reinforcing body 320 is not provided, as shown in FIG. 4 which is a plan view of the base portion, when viewed from above and below, the right front force point (mounting portion 313), the left front fulcrum (mounting portion 313) and the right side In the triangle formed by the rear fulcrum (attachment portion 313) (shown by the broken line in the figure), each fulcrum has no symmetry with respect to the right front force point (attachment portion 313). On the other hand, when the base reinforcing body 320 is provided as in the present embodiment, as shown in FIG. 4, the right front force point (attachment portion 313), the left front fulcrum (connecting portion 322), and the right rear fulcrum (attachment) A triangle formed by a portion 313) (shown by a solid line in the figure) is an isosceles triangle having an isosceles vertex at the right front force point (attachment portion 313), and for each right front force point (attachment portion 313), The fulcrum has symmetry. For this reason, since the distance between the right front mounting portion 313 and the left front connecting portion 322 matches the distance between the right front mounting portion 313 and the right rear mounting portion 313, the rigidity from the right front side to the right rear direction. And the rigidity from the right front side to the left front side direction are improved so that the erected frame member is not greatly inclined to the front side, but is simply deformed downward. Further, as described above, the center of the base reinforcing body 320 and the center of the base main body 310 are substantially coincided with each other when viewed from above and below, and the base reinforcing body 320 is provided symmetrically with respect to the center of the base main body 310. Therefore, even if any four corners of the base part 300 become unsupported with respect to the floor, the base reinforcing body 320 acts to prevent twisting due to the rigidity imbalance of the base part 300.

  Here, as shown in FIG. 5, a recess 314 is formed along the longitudinal direction of the flange portion 312 of the base body 310. The recess 314 can increase the rigidity of the flange portion 313 and suppress downward deformation (deflection) of the base portion 300. Further, as described above, in the base main body 310 shown in FIG. 3, the flange portion 312 formed on the outer peripheral edge of the bottom plate 311 is provided by providing a recess in the bottom plate 311. Since the cross-sectional shape dimensions of the frame members 315 are all made the same using the frame member 315 of the square pipe as shown in FIG. 6 and the cross-sectional secondary moment can be increased, the rigidity of the base portion 300 is enhanced. In addition, in order to improve the rigidity imbalance of the base portion 300, the square pipes arranged at the front and rear use square pipes having different cross-sectional shapes than the square pipes arranged at the left and right. It is. Since the rigidity balance of the base portion 300 is not made uniform by the frame member 315, the weight of the base portion 300 can be reduced and the cost can be reduced by making all the cross-sectional dimensions of the square pipes the same. Further, unlike the embodiment shown in FIG. 3, as shown in FIG. 7, an integrated portion 330 is provided in which the mounting portion 313 of the base body 310 and the connecting portion 322 of the base reinforcing body 320 are integrally formed. . In detail, it is integrally formed with a back plate (not shown) and a side plate (not shown) erected along the outer peripheral edge of the back plate, with its opening facing downward and connected to the mounting portion. The lower part of the integral part 330 is connected to the flange part 312 or the frame member 315 of the base main body 310 so that the lower part of the side part of the base main body 310 is aligned with the lower part. For this reason, the integrated part 330 of the attachment part and the connecting part is more effective as a fulcrum of deformation of the base part 300. Further, when increasing the rigidity of the entire base portion 300, it is not necessary to increase the rigidity without increasing the thickness of the entire bottom plate of the base portion 300, and only the integral portion 330 of the attachment portion and the connecting portion is increased in thickness. By increasing the rigidity, it is possible to easily increase the rigidity of the entire base portion 300 and to act to suppress downward deformation (bending) of the base portion 300. Further, since the flange portion is not formed between the attachment portion 313 and the connecting portion 322, the flange portion 312 or the frame member 315 of the base body 310 can be omitted, and the shape of the base body 310 can be simplified. Can also be formed.

  FIG. 8 is a perspective view showing the configuration of the mounting portion of FIG. The attachment portion 313 shown in the figure is formed by a back plate 313-1 and a side plate 313-2 erected along the outer peripheral edge of the back plate 313-1. The attachment portion 313 is the base main body 310 of FIG. The bottom plate 311 is a separate member. Similarly, the connecting portion 313-3 in FIG. 8 is also formed by the back plate 313-1 and the side plate 313-2. Furthermore, the mounting part 313 and the connecting part 313-3 formed by separate members are arranged so that the opening part 313-4 faces downward and the lower part of the mounting part 313 is along the lower part of the side plate of the base body 310, Further, a notch (not shown) is provided in the flange portion 312 and the side plate of the base body 310 so that the base plate 310 can be connected to the base body 310, and the side plate is attached to the notch portion so as to face the side plate of the attachment portion and the connecting portion. Formed. Further, as shown in FIGS. 9 and 10, since the casters 313-5 are attached to the lower surface of the back plate 313-1 of the attachment portion 313, the caster-side attachment board occupies a position above the base body 310. As a result, the base portion 300 occupies a lower position close to the floor surface, and the height of the lower skeleton body 200 in FIG. 2 can be suppressed and the vertical volume inside the lower skeleton body 200 is increased. can do. Therefore, a large amount of transfer paper can be stored inside the lower skeleton body 200. Moreover, the portability of the whole apparatus is improved by attaching the casters 313-5. Furthermore, as shown in FIG. 11, as a means for placing on the floor, a convex portion 313-6 made of an elastic member such as rubber is provided on the lower surface of the back plate 313-1 of the mounting portion 313. It can be suitably used for printers.

  Next, FIG. 12 is a perspective view showing the configuration of the intermediate member of FIG. As shown in the figure, the intermediate member 321 includes a back plate 321-1, a side plate 321-2 erected along the outer periphery of the back plate 321-1, and a longitudinal edge of the side plate 321-2. It is formed with the arranged flange 321-3. Then, as shown in FIG. 13, the flange 321-3 is connected to the bottom plate 311 of the base body 310, so that the intermediate member 321 is configured in a square pipe structure. 3 is also supported by the intermediate member 321, thereby acting as a fulcrum for deformation of the base portion 300. Since the intermediate member 321 has a square pipe structure as shown in FIG. 13, its rigidity is increased, and the effect as a fulcrum of deformation of the base portion 300 is more exhibited.

  Next, FIG. 14 is a perspective view showing the configuration of the joint of FIG. As shown in the figure, the joint portion 323 is formed by a back plate 323-1 and a side plate 323-2 erected along the outer peripheral edge of the back plate 323-1. In order to arrange the intermediate member 321 on the diagonal of the square formed by the four connecting portions 322 so as not to interfere with each other, the joint portion 323 is located at a position where the center of the square and the center of the joint portion 323 substantially coincide with each other. And the end of the intermediate member 321 is connected so as to face the side plate 323-2. For this reason, the rigidity of the intermediate member 321 can be improved compared to the case where the intermediate members 321 are connected directly by providing notches or the like so that the intermediate members 321 do not interfere with each other. Thereby, the connection part 322 supported by the intermediate member 321 exhibits more the effect | action as a fulcrum of a deformation | transformation of the base part 300. FIG.

  Further, as described above, the base reinforcing body 320 of the base portion 300 shown in FIG. 3 is configured to include the intermediate member 321, the connecting portion 322, and the joint portion 323. As shown, the intermediate member 324 is integrally formed with the bottom plate 311 of the base body 310 of FIG. That is, the intermediate member 324 is formed as a convex portion on the bottom plate 311 of the base body 310. Further, as shown in FIG. 16, the joint portion 325 is formed of a back plate and a side plate standing along the outer peripheral edge of the back plate. Accordingly, the opening side of the bottom plate 311 of the base body 310 integrally formed with the intermediate member 324 of FIG. Thereby, the opening side of the convex part of the bottom plate 311 in the base body 310 integrally formed with the intermediate member 324 is blocked, and the intermediate member 324 can be configured in a square pipe structure. Therefore, the connecting portion 322 in FIG. 3 is also supported by the intermediate member 324, thereby acting as a fulcrum for deformation of the base portion 300. Further, by making the intermediate member 324 into a square pipe structure, its rigidity is increased, and the effect as a fulcrum of deformation of the base portion 300 is more exhibited. Here, when connecting the connecting parts 322 located diagonally with two intermediate members, in order to avoid the intermediate members interfering with each other at the center of the base part, separate from the square pipe at the diagonal center. There are a method using a member joining member and four square pipes, and a method of combining a joint by providing notches in the square pipe. In the method using the joint member and the four square pipes which are different from the square pipe at the diagonal center, the square pipe may be bent due to its own weight or the like. In addition, in the method in which notches are provided in the square pipe and combined joining is performed, discontinuity of the cross-sectional shape occurs in the square pipe at the joint, and there is a risk of causing a reduction in rigidity and stress concentration. Therefore, as shown in FIG. 17, an opening 326 is provided on the upper surface of the square pipe so that the square pipes can be joined without interfering with each other and the continuity of the cross-sectional shape is maintained. A notch 327 is provided on the side of the square pipe along Thereby, the notch protrusion part 328 is formed between the two notches 327 and the notches on the side surface of the square pipe. Furthermore, as shown in FIG. 18, the slit part 329 was provided along the width direction of the lower surface of a square pipe. Then, as shown in FIG. 19, two intermediate members of this square pipe are used, the openings 326 are arranged so as to face each other, and the notch protruding portion 328 is inserted into the other slit portion 329. As shown at 20, the intermediate members of the two square pipes are joined without causing interference. At this time, the joint portion of the square pipe forms a closed space surrounded by hexagons by the slit portion 329 of the square pipe, the lower surface between the slit portions, and the cutout projecting portion 328. Accordingly, the intermediate member of the square pipe can have a uniform cross-sectional shape at the joint portion and the portion other than the joint portion. For this reason, the square pipes do not interfere with each other, and the continuity of the cross-sectional shape is maintained and can be joined. Therefore, the rigidity of the intermediate member is increased, and the action as a fulcrum of deformation of the base portion is more exhibited.

  The present invention is not limited to the above-described embodiments, and it goes without saying that various modifications and substitutions are possible as long as they are described within the scope of the claims.

1 is a cross-sectional view schematically illustrating an electronic copying machine that is an example of an image forming apparatus of the present invention. 1 is a perspective view illustrating an example of a structure of an image forming apparatus according to an embodiment of the present invention. It is a perspective view which shows the structure of the base part of FIG. It is a top view which shows the structure of a base part. It is a perspective view which shows the structure of the base part containing the flange part which has a recessed part. It is a perspective view which shows the structure of the frame member of a square pipe. It is a perspective view which shows the structure of the base part containing the integrated part of an attaching part and a connection part. It is a perspective view which shows the structure of the attaching part of FIG. It is a perspective view which shows the structure of the attaching part which attached the caster. It is a perspective view which shows the structure of the attaching part which attached the caster. It is a perspective view which shows the structure of the attaching part which attached the convex part. It is a perspective view which shows the structure of the intermediate member of FIG. It is sectional drawing which shows the square pipe structure of an intermediate member. It is a perspective view which shows the structure of the junction part of FIG. It is a perspective view which shows the structure of another intermediate member. It is a perspective view which shows the structure of another junction part. It is a fragmentary perspective view which shows the structure of the intermediate member of a square pipe. It is a fragmentary perspective view which shows the structure of the intermediate member of a square pipe. It is a perspective view which shows a mode that the intermediate member of two square pipes is combined. It is a perspective view which shows a mode that the intermediate member of two square pipes was combined.

Explanation of symbols

100; upper skeleton body; 200; lower skeleton body; 300; base portion;
310; base body, 311; bottom plate, 312; flange portion,
313; attachment portion, 314; recess, 320; base reinforcement,
321, 324; intermediate member, 322; connecting portion, 323, 325;
313-5; casters, 313-6; convex portions, 326; openings,
327; Notch part, 328; Notch protrusion part, 329; Slit part,
330; integral part.

Claims (18)

Structure of an image forming apparatus comprising an upper skeleton body that stores and holds at least a document reading unit and an image forming unit, a lower skeleton body that stores and holds at least a paper feeding unit, and a base portion that supports the lower skeleton body In the body,
The base portion is
A bottom plate, a flange portion provided inside the bottom plate with a concave portion formed on the outer peripheral edge of the bottom plate, a side plate erected along the outer peripheral edge of the flange portion, and a device disposed around the four corners of the bottom plate A base body provided with a mounting portion for attaching a member of the lower skeleton body to install the body;
An intermediate member disposed at a disposition position between each of the attachment portions and the flange portion in the longitudinal direction, a connecting portion connecting the intermediate member and the flange portion in the longitudinal direction, and the disposition facing the diagonal line A structure of an image forming apparatus, comprising: a base reinforcing body including a joint portion that joins all the intermediate members disposed at positions via the connecting portion. Structure of an image forming apparatus comprising an upper skeleton body that stores and holds at least a document reading unit and an image forming unit, a lower skeleton body that stores and holds at least a paper feeding unit, and a base portion that supports the lower skeleton body In the body,
The base portion is
A bottom plate, a side plate disposed on an outer peripheral edge of the bottom plate, a frame member disposed along the side plate, and a member of the lower skeleton body that installs a device main body disposed around four corners of the bottom plate. A base body provided with a mounting portion for mounting;
An intermediate member disposed at a disposition position between each of the attachment portions and the frame member in the longitudinal direction, a connecting portion that couples the intermediate member and the frame member in the longitudinal direction, and the disposition facing the diagonal line A structure of an image forming apparatus, comprising: a base reinforcing body including a joint portion that joins all the intermediate members disposed at positions via the connecting portion.   The planar shape formed by each of the coupling portions disposed at the disposed position is a square, and the center of the square is aligned with the center of the planar shape of the base body so that the coupling portion is disposed. The structure of the image forming apparatus according to claim 1, wherein the structure is disposed at a position.   The length between the disposition position where the connecting portion is disposed and the attachment portion on the opposite side in the longitudinal direction of the base body at the disposition position, and the attachment in the short direction of the base body The structure of the image forming apparatus according to claim 3, wherein the connecting portion is arranged at the arrangement position so that the lengths between the portions coincide with each other.   The mounting portion, the connecting portion, and the flange portion using a side plate formed so as to face the mounting plate and the side plate of the connecting portion at a notch portion that connects the mounting portion and the connecting portion to the flange portion. The base part of the image forming apparatus structure according to claim 1, wherein the two are connected.   Using the side plate formed so as to be opposed to the side plate of the attachment part and the connection part in the notch part connecting the attachment part and the connection part to the frame member, the attachment part, the connection part, and the frame member And a base portion of the image forming apparatus structure according to claim 2.   The structure of the image forming apparatus according to claim 1, wherein a groove having a concave shape is formed along a longitudinal direction of the flange portion.   The structure of the image forming apparatus according to claim 2, wherein a groove having a concave shape is formed along a longitudinal direction of the frame member.   9. The structure of an image forming apparatus according to claim 2, wherein the frame member is formed of a square pipe.   The structure of the image forming apparatus according to claim 9, wherein the cross-sectional shape dimensions of the frame members of the square pipe are all the same.   3. The image forming apparatus according to claim 1, wherein the attachment portion and the connection portion adjacent to the attachment portion are integrally formed by a back plate and a side plate standing along an outer peripheral edge of the back plate. Structure.   The structure of the image forming apparatus according to claim 1, wherein a caster is attached to a lower surface of the back plate of the attachment portion.   The structure of the image forming apparatus according to claim 1, wherein a convex installation leg is attached to a lower surface of the back plate of the attachment portion.   The intermediate member is formed by a back plate, a side plate erected along the outer peripheral edge of the back plate, and a flange disposed on a longitudinal edge of the side plate, and the flange and the bottom plate of the base body are formed. The structure of the image forming apparatus according to claim 1, wherein the intermediate member is connected to form a square pipe structure.   The intermediate member is formed by a square pipe, and is formed between an opening on the upper surface of a part of the square pipe and a notch provided on a side surface of the square pipe along an end of the opening. A notch protrusion and a slit portion disposed along the width direction on the lower surface of the square pipe, the openings in the two intermediate members of the square pipe are opposed to each other, and the notch protrusion is the other intermediate member. The image forming apparatus according to claim 1, wherein the two intermediate members are connected by being inserted into the slit portion.   The said junction part is formed with the back plate and the side plate standing along the outer periphery of this back plate, The edge part of the said intermediate member was each connected with the side plate of the said junction part. Structure of the image forming apparatus.   The structure of the image forming apparatus according to claim 16, wherein a notch is provided between the side plates adjacent to each other of the joint. An image forming apparatus comprising at least a document reading unit, an image forming unit, and a paper feeding unit mounted on the structure of the image forming apparatus according to claim 1.

Images